Question
Question 11 The use of 4B5B encoding enables 100BaseTx Ethernet LANs to use a simpler form of line coding (i.e., NRZ-Inverted). However, by doing this,
Question 11
The use of 4B5B encoding enables 100BaseTx Ethernet LANs to use a simpler form of line coding (i.e., NRZ-Inverted). However, by doing this, a 20% overhead penalty resulting in a reduced data throughput is incurred.
True
False
10 points
Question 12
For 802.3 LANs, a hybrid canceller transceiver device is used which enables full-duplex data communications
True
False
10 points
Question 13
What is correct regarding 100Base-TX?
| a. By using 4B5B coding, only 80% of the logical data sent represents real information (i.e., 20% of the bits are considered overhead) | |
| b. Can operate in full or half-duplex modes over two pair or single pair wire respectively. | |
| c. Operates over Cat5e UTP which enables a signaling rate of 125 MBaud | |
| d. All are correct |
10 points
Question 14
In order to achieve 1Gbps (1GbE) over Cat5e cabling, what needs to be done?
| a. Use all four wire pairs in full-duplex | |
| b. Apply PAM-5 modulation to achieve N=2 (bits per symbol) | |
| c. Use hybrids that enable full-duplex transmission over a single wire pair | |
| d. All of the above |
10 points
Question 15
Select the correct statement(s) regarding 802.11 WLANs.
| a. Operates over unlicensed ISM frequencies | |
| b. Implements spread spectrum or OFDM techniques for better noise resistance and spectral efficiency | |
| c. Uses CSMA/CA since collisions are always possible | |
| d. All of the above are correct |
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